Drive Torque Control Using Wheel Speed Feedback for Launch Grip
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Solution Overview
Problem
Existing methods for operating motor vehicle drive devices struggle to achieve maximum acceleration while minimizing wheel slip, particularly during launch control, as they often require adjustments that are either too slow or lead to unnecessary torque reduction.
Innovation Solution
The method involves the engine control unit determining a correction factor from the rotational speeds of driven and non-driven wheel axes to set a setpoint torque, which is then used to control the drive unit, reducing wheel slip and maintaining high torque by pre-tuning the air charge and ignition timing for rapid torque adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the preset torque is adjusted to reduce wheel slip, then wheel slip is minimized, but the acceleration speed is reduced due to time-consuming air charge adjustment
Solution Approach 1:
The air charge is pre-adjusted before torque adjustment is needed. The method determines a first air charge based on a first target torque, adjusts the air charge to this predetermined value in advance, and then quickly adjusts ignition timing to achieve the final torque target. This preliminary preparation eliminates the need for time-consuming air charge adjustment during critical torque changes.
Solution Approach 2:
The system dynamically selects different control strategies based on operating conditions. It determines whether to adjust air charge or ignition timing based on current torque requirements and wheel slip conditions, optimizing the balance between response speed and torque control precision in real-time.
2Reliability
If the preset torque is reduced to minimize wheel slip, then wheel slip is controlled, but unnecessary torque reduction occurs which limits acceleration
Solution Approach 1:
The system continuously monitors wheel slip and provides feedback to the control unit. Based on this feedback, the control unit determines the appropriate torque adjustment strategy - either adjusting air charge or ignition timing - to achieve the target torque while minimizing wheel slip, rather than unnecessarily reducing torque.
Solution Approach 2:
The system changes different parameters depending on the situation: sometimes adjusting air charge, sometimes adjusting ignition timing. This flexible parameter selection allows the system to achieve precise torque control and wheel slip management without unnecessary torque reduction, optimizing both power delivery and traction control.
Data Source
Figure 1
AI summary
The invention relates to a method for operating a drive device for a motor vehicle, wherein the drive device has a drive unit with an engine control unit and a preset torque to be provided by the drive unit can be set on the engine control unit. In this case, it is provided that, in a first operating mode, the engine control unit determines a correction factor from a first rotational speed of a first wheel axis of the motor vehicle, which is driven by means of the drive unit, and a second rotational speed of a second wheel axis of the motor vehicle, which is not driven by means of the drive unit, determines a setpoint torque from the preset torque and the correction factor, and actuates the drive unit at least temporarily to generate an actual torque corresponding to the setpoint torque. The invention further relates to a drive device for a motor vehicle.